Connecting one or several soda melting-furnaces to alpha rotating furnace



March 1932- B. H. 0. DE VERDIER CONNECTING bNE OH SEVERAL SODA MELTINGFURNACES TO A ROTATING FURNACE Filed Nov. 10, 1950 2 Sheets-Sheet lMarch 29, 1932. a. H. 0. DE VERDIER 1,851,814

CONNECTING ONE OR SEVERAL SODA MELTING FURNACES TO A ROTATING FURNACEFiled Nov. 10, 1930 2 Sheets-Sheet 2 Patented Mar. 29, 1932 UNITEDSTATES.

BROR HELMER OLOF DE VERDIER, OF FREDRIKSBERG, SWEDEN CONNECTING ONE ORSEVERAL SODA MELTING-FUR-NACES TO A ROTATING FURNACE Application filedNovember 10, 1930, Serial No. 494,735,.and in Sweden September 14, 1929.

melting-furnace to the rotating furnace.

Said difficulties are based upon the fact that the gases which are to beintroduced from the melting-furnace into the rotating furnace have avery high temperature resulting in a very strong draught effect throughthe intervening spaces which cannot be wholly avoided at the connectionof the melting-furnace with the rotating furnace. The tightening devicestried hitherto have also involved the disadvantage that they, due to theheat, have been subjected to very rapid destruction. One has tried toavoid this by using water cooling or by pressing in blast-air. Thelast-mentioned devices cause, however, extra costs, and yet they havenot given satisfactory results. The

devices used heretofore have been very unsatisfactory also in therespect that it has not been possible to control the supply of air tothe rotating furnaces.

The object of the present invention is to avoid said disadvantages, i.e. leakage of heat gases with accompanying losses of heat, destructionof material and dirtying, by preventing draught effect in the spacebetween the gas canal of the melting furnace or the gas neck and therotating furnace. This is effected according to the invention by the useof construction such that about the gas neck there is arranged a chambercontaining air of a relatively low temperature, the outer portion ofwhich embracing the rotating furnace supports a packing device known perse. The chamber may be open at the bottom and, if desired, be providedwith sliders which may be raised or lowered or otherwise controlled inorder to decrease or increase the effective height of the chamber.

The chamber is provided with sliders which may be raised or lowered orotherwise controlled. One or several charge openings may be located inthe chamber in order to feed the raw material from the rotating furnacedown into the melting-furnace.

The appended drawings illustrate diagrammatically an embodiment of adevice according to the invention. Fig. 1 shows a vertical longitudinalsection of the furnace assembly along the line 1-1 of Fig. 2. Fig. 2 isa view from above of the furnace assembly; Fig. 8 is a vertical crosssection of the. melting-furnace and the gas neck taken along the lineIII1II of Fig. 1, and Fig.1 4 is a vertical longitudinal section alongthe line IVIV of Fig. 3. 1 indicates the meltingfurnace, 2 the gasneck,and 3 the rotating furnace. The connection between the gas neck 2 andthe rotating furnace 3 is built into the chamber 4 which is providedwith a tightening device 5 which prevents the efilux of the air enclosedin the chamber 4. All the walls of the chamber 4, which is shut offupwards, extend so far downwards towards the floor plane 9 that nodraught effect arises at the lower edge 6 of the wall. The air volume inthis chamber thus becomes relatively free from currents, and acts at thesame time as heat insulation, and prevents the warm gases passing fromthe meltingfurnace to the rotating furnace from flowing out through thespace 7. The temperature of the enclosed air volume thus becomesrelatively low, and by means of simple packing devices 5, arrangedbetween the rotating furnace and the chamber, the enclosed air 'isprevented from escaping into the free air. The height of the lower edge6 of the wall is determined by the draught effect in the inlet of therotating furnace. If the effect of the draught varies in the rotatingfurnace, one may by means of sliders arrange in such a way that the saidlower edge of some portion of the walls may be controlled. Thisarrangement may be also be carried out in such a way that the chamber 4becomes quite shut off towards the atmosphere, and, if desired, providedwith one or several sliders 8. By the last-mentioned arrangement, theair inlet of the rotating furnace may be controlled. It may also bearranged in such a way in this embodiment that the raw material from therotating furnace is automatically charged into the melting-furnace insuch a way that this takes place in the cham her 4, the feeding opening10 of the melting furnace being directly connected to the horizontalbottom of the chamber. Thus, the smoke, dust and dirt arising when theraw material is discharged in the free working room are avoided. Thecharge opening to the melting furnace may also be arranged within thewalls of the chamber 4, thus admission of undesired air or exhaustion ofgas from or to the working-chamber is avoided.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is: V

1. In combination, a rotary furnace adapted to rotate about a horizontalaxis, a stationary melting furnace, a gas neck connecting the rotaryfurnace and the melting furnace, and an air chamberembracing the jointbetween the gas, neck and the rotary furnace.

2. The apparatus, set forth in claim 1, in which the air chambercomprises a shutter for controlling the amount of air entering saidchamber for admission into the rotary furnace.v

' 3, The apparatus set forth in claim 1, in which the air, chamber hasan opening for feeding materi al from the rotary furnace into themelting furnace.

4. The apparatus set forth in claim 1, wherein the rotary furnace isconnected to a plurality of stationary melting furnaces through a commongas neck.

5. The apparatus setforth in claim 1, including a packing device betweenthe air chamber and the rotary furnace.

In Witness whereof I have hereunto signed my name.

* BROR HELMER OLOF de VERDIER.

